# Definition of Octahedron

An octahedron is a polyhedron. It has eight flat faces, and six vertices. Each face is a triangle.

We say that an octahedron is regular if each of its faces is an equilateral triangle. The regular octahedron is one of the Platonic solids.

### Description

The aim of this dictionary is to provide definitions to common mathematical terms. Students learn a new math skill every week at school, sometimes just before they start a new skill, if they want to look at what a specific term means, this is where this dictionary will become handy and a go-to guide for a student.

### Audience

Year 1 to Year 12 students

### Learning Objectives

Learn common math terms starting with letter O

Author: Subject Coach
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